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The Study on Rheological Properties of Rocks Undergoing Disturbance and Experimental System

Author: CuiXiHai
Tutor: GaoYanFa;LiuChengLun;XiaoHongTian
School: Shandong University of Science and Technology
Course: Mining engineering
Keywords: rock rheology rheology disturbed effects testing system constitutive equation sensitive domain of rock-disturbed rheology
CLC: TD315
Type: PhD thesis
Year: 2007
Downloads: 383
Quote: 2
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Abstract


Stress of soft rock in deep mining is close to strength limit state, rock is sensitive to outer disturbed loading, research project was put forward in order to study rock rheology disturbed effects. Firstly, R&D of testing system of rock rheology disturbed effects was made, a testing system include system of constant force loading, triaxial pressure box, system of disturbance loading and measuring have been design. In order to carry out the testing research normally, rigidity and testing accuracy of the system are analyzed. The conclusion that rigidity and testing accuracy of the system are met the needs of the testing research is obtained. Then, study on rock creep under uniaxial compression and disturbed effects of rock creep were carried out, constitutive equation of disturbed effects of rock creep under uniaxial compression was established. On the basis of uniaxial compression test, rock creep of compression and disturbed effects were studied under low confining pressure; concept of sensitive domain of rock-disturbed rheology was defined. And then constitutive equation of disturbed effects of rock creep under low confining pressure was established and verified. Influence of confining pressure on parameters of rock creep, such as creep strength, beginning stress for creep and coefficient of viscosity is studied, and some laws about confining pressure effects to creep parameters of rocks have been obtained. Finally, experimental study on deformation laws of strain softening rock and disturbed effects was carried out, and deformation laws of strain softening rock under disturbance condition were obtained. Simulative disturbed loads are applied, including impact loads and vibration loads.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Theory of rock pressure > Rock mechanics test
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